Of course - but the use of PTFE tape on everything with a thread is not the
solution to leaks. Most domestic modern applications - other than radiator
tails will not use the fittings you sug

Got to agree with you John, I have never found a compression fitting designed to seal with an olive make a satisfactory seal with anything else no matter how much PTFE tape you put on the thread. A tap connector with a fibre washer no chance, a rubber washer I will grant you a maybe.

Richard