going over the credits for Taken 3. The principal crew from the film opening credits are without accents and have a credit of screenwriters and 3 crew for sound.
from the film ending credits they list some of the principal crew again with accents in their names and instead of screenwriters they are credited as writers. The sound guys in the ending credits have specified jobs  such as PSM, SSE.
what credits per invelos do we use. I found nothing in the rules but - Crew and Cast
Take Crew Credits from the film credits only; list names exactly as they are in the credits. Exception: If the credit information is entirely capitalized, use standard capitalization rules instead.

Has Ken specified opening credits trump ending credits in a thread somewhere.

Quoting GreyHulk:

Quote:
For the purposes of this section we define "standard" film credits as those where all credited actors involved are listed at the end of the film - defined here as the "end credits". The section details both the actor’s Name and the Role that they played in the film. The credits may be listed "in order of appearance", "alphabetical order" or in an order of importance decided by the filmmakers. Some actors may be credited a second time in either credits at either the opening or close of the film.

Pretty sure we go with the closing credits as indicated above.

for cast yes but for crew?

Quoting huskersports:

Quote:
If the crew are listed in both the opening and closing credits, use the closing credits. If ONLY in the opening credits, use the opening credits.

I would agree with this. That's what I was trying to say.

Quoting LKanne:

Quote:
amazing -> so many boys a long time in here and discussing stuff with ancurrent rules...

f. e. "If the crew are listed in both the opening and closing credits, use the closing credits. If ONLY in the opening credits, use the opening credits."

this is past.
Why don't you read the current rules (?) and try to to understand them? 

Nice answer - FO. This is the first time I've come across a film credit with complete principal crew in the ending.
And since there is nothing in the rules per crew about this issue, I asked.  What a doucebag.

I checked the credits and if it were me, they get all the roles they are credited with; screenwriters, writers, PSM, etc. There are also several roles missing from the end credits. You will have to go with common name for the issue about accents.