I can't answer the question of how to tell the difference between Tamaskan, Saarloos WD and Czech WD...maybe someone else who owns all three breeds could. lol.
As for wolf content, there is definitely wolf content in the breed - in certain lines. Two of the breed founders used wolfdogs and lied about it - they're often referred to as the Blus (Blufawn and Blustag). They are no longer with the TDR
and they do run their own TDR, which comprises of just themselves...at the moment, I believe Blustag is their only breeder.
Foundation dogs are listed on the TDR website here: http://www.tamaskan-dog.org/breed-info/foundation-dogs/
Wolf content comes from the following dogs (someone correct me if any of this info is wrong
Oxbow Leva-Neve (Oskari) - from Polar Speed Kennels
Rumors are that he is the same as Polar Speed Oskari that appears in Tamaskan pedigrees. Czechoslovakian Wolfdog from Polar Speed Kennels. Blustag purchased several of his offspring to use as foundation dogs. Those dogs include the following: Two Socks @ Moonstone (Zev) (Oskari's granddaughter?), Kwakiuth @ Alba (Magnus) (Oskari's grandson?), Jackal @ Blustag, Dingo @ Blustag, Susi @ Blustag (Oskari's granddaughter)
Two Socks @ Moonstone (Zev)
She was used for one registered litter, of which 3 offspring went to breeding homes: Moonstone Make Me Pure @ Alba (Odin), Moonstone Lovelight (Tasha) and Moonstone Eternity (Tundra). Tasha and Tundra, unfortunately, ended up in a puppy mill known as Right Puppy Kennel through no fault of their breeder.
Kwakiuth @ Alba (Magnus)
He appears in the pedigrees of the breeding dogs from the following kennels: Alba, Double J (J&J), Tarheel, Hawthorne, Starlight, Conchur and Blufawn.
Jackal @ Blustag
Czechoslovakian Wolfdog x Siberian Husky - unfortunately, he was overused by Blustag; he is a monorchid carrier/producer with dubious hip scores (likely failing).
Dingo @ Blustag
Half brother to Jackal @ Blustag. His is the result of a father/daughter breeding done at Polar Speed Kennels. He is a monorchid carrier/producer. The following kennels have Dingo in their lines: Blustag, White Elk, Conchur, Sylvaen and Faelan.
Susi @ Blustag
She is a suspected monorchid carrier/producer. The following kennels have Susi in their lines: Conchur and Sylvaen.
Boogie a/k/a Ivan
Mid to High content wolfdog - he supposedly sired Whitefang (Valko) and Jodie (Henki); both Whitefang and Jodie were used as foundation dogs.
Whitefang is the sire of 2 litters, of which offspring were used in the Tamaskan lines by Blustag. He produced Heidi @ Blustag (Whitefang x Sara) and Blustag's "Little" litter (Whitefang x Paloose) of which two offspring was used for breeding: Skye and Summer.
Heidi @ Blustag
I don't remember how many litters Heidi produced, but her offspring went breeding homes. The kennels that have Heidi in their breeding stock's lines are: Saxon, Sylvaen and White Elk.
Skye - Blustag Little Bear
I don't think Skye sired more than 5 litters, but his offspring went to breeding homes as well. The kennels that have Skye in their breeding stock's lines are: Blustag, Moondance, Hawthorne and Nahani.
Summer - Blustag Little Sunshine
I believe Summer only produced 2 litters, but her offspring went to breeding homes as well. The kennels that have Summer in their breeding stock's lines are: Blustag, Muensterland, Wolfsbane, Weylyn, Tarheel and HiTenshi.
Jodie produced only 2 litters. For her second litter, there were two sires used: Jackal and Dingo. The following kennels have Jodie in their lines: Blustag, Wolfsbane and Asgard.
Djoser van Rijneckerhof (Bobbi) - Saarloos
He was added as a foundation dog in 2009 and sired one litter with Summer (Blustag Little Sunshine). On pedigrees made by the Blus, he appears as "Blustag Apache Horse", who was made up to cover the fact that a Saarloos was used. The kennels that have Bobbi in their breeding stock's lines are: Blustag, Muensterland, Wolfsbane, Weylyn, Tarheel and HiTenshi.