picforth & 16F87x <-> 16F874 pin-compatibility ?

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I'm keen to download and try the:
Forth compiler for PIC 16F87x
which is so well documented at:
http://www.rfc1149.net/devel/picforths

Some year(s) ago I borrowed the hardware (programmer)
to program a 16c84, which I'm told has been obsoleted by the
16f84. Same pinout presumably ?

Is the 16F87x pin compatible with the 16c84 ?

If not, are the voltage a pulse wave-forms/time the same ?

Are there any other picforths experienced programmers
on this forum ?

Thanks for any advice,

== Chris Glur