Can I use F-14A early userskin on WT live for F-14B?

I just got F-14B, but there is no topgun skin for it so I want to check is it possible to use F-14A skin for F-14B

Seeing as they are different models, no. You could change the files so the game recognises it as a F-14B skin however it would be bugged as the airframe has major differences.

Just wait for a top gun skin to come out for the F-14B.