K03s oil lines reusable with k04 turbo? Also to fit S3 injectors, what i need?

[Sammy]

I was told this by someone from the forum but how true is this? He told that i do not need to replace if all is good.

Also i have 4 S3 injectors do i need to get the rubber o ring's for them or anything else needed to fit or is it a straight swap?