In response to post #67804141. #67822741, #68070506, #68108726, #68347966, #68472371, #68505991, #68883051, #74730148 are all replies on the same post. No. Fallout 4 can not use FNV voices because they are stored in a different format. To transfer them they would need to make a tool to covert them, and they did. But they can not release it or even explain how it works because that is prohibited by Bethesda. I don't know how this legal bullshit works and devs apparentyly don't know either but that's how it is. So the only way is to re-record everything. Watch kinggath's interview with Metamoth for details.