I would start with an application-realistic collector-emitter
I-V curve pull and see whether the diode characteristic
(if any) matches your 4n60d. Then maybe look at whether
4n60 and 4n60d are actually different in construction, or
only that the "d" adds specs on a diode that's there to
begin with, but had no specs.
Now sending you differently-marked parts than ordered,
is a no-no. What recourse you have, is known only to you
and the seller. You may be screwed by the fine print, or
not. But if this is a "too bad about those sanctions, but I
can help you out" transaction you probably have not so
many options and may be dealing with some shady gray
market stuff.