Yes and no. NK-33 was developed from NK-15 but had a lot of difference. Mainly, NK-15 could not be restarted (i don't mean in flight, but at all: it could be li

Yes and no. NK-33 was developed from NK-15 but had a lot of difference. Mainly, NK-15 could not be restarted (i don't mean in flight, but at all: it could be lighted only once, then it went to the scrapyard). So, it couldn't be TESTED. That's why N-1 had 100% failure rate (another reason was a buggy engine-out management system, which was designed to enable rocket to fly with some engines out, but in fact did the reverse, twice causing it to fail when then failed engines could be simply ignored). NK-33, on the other hand, could be restarted many times, and some copies counted a lot of time on the test stand.