Are there any ways to identify uncredited foreign dubbed voice actors?

For Germany you can take a look at 

https(:)//www.synchronkartei(.)de/

remove the gaps.

@geeked_out_4_movies​ 

P.S.: You have to put in the German names of the movies which may be different. But you can look at that issue on IMDb.

@geeked_out_4_movies​ 

(The first posting was privated)

For Germany, you can look at:

w w w . Synchronkartei . d e

When you choose the tab "Kartei", there opens a line for input.

I've put in Julian Sands. His entry appeared and showed 75 entries of movies including his dubbing actor for each specific movies of them.

@geeked_out_4_movies​ 

For Spain, the most comprehensive database is: https://www.eldoblaje.com 

yeah the movies im looking for are not listed on these sites due to being rare and older. 

Which movies do we talk about?

@Breumaster​  ? :)

@geeked_out_4_movies​ 

Didn't you understand the question which movies you meant?