Of course they are.
Just slightly different, which is normal after thousands of years and thousands of miles distance, because things evolve. But vedic and germanic mythology still have the same indo-european roots. Just compare the norse description of Thor, or the german description of Donar with the Rig-Veda 10.22.3-4 or 10.96. A blond man, with a blond beard and golden hammer on a chariot with two animals in front of it (yes, thats right, Indra's vajra is described like a hammer there). And he also loves too drink a lot of Soma.
Indra is the son of Dyaus (heaven) and Prithivi (earth)
Thor/Donar is the son of Odin/Wotan (heaven) and Jörd (earth)
I think most indian people do not have that much insight into north-european mythology, as most europeans know almost nothing about hinduism or the veda. That way both sides overlook the vast amount of similarities.