This article is from the Toys FAQ, by firstname.lastname@example.org (Scott Gordon) with numerous contributions by others.
From Randy Matthews (email@example.com):
"As for the Invisible Woman versions, there have been four figures
released within the last 3 years:
Marvel Superheroes Card
Invisible Woman 1 (1993) - this is the one that changes color.
Apparently Toy Biz had some problems making it work correctly
and this figure was discontinued.
Invisible Woman 2 (1994) - this one does not change colors. It
is packaged with an 'invisible' catapult launcher (the first
version did not have this launcher).
Fantastic Four Card
Invisible Woman 1 (1995) - this is a repainted Spider-Woman
figure from the Iron Man line. It was produced between the
first and second series of the FF line to satisfy demand for a
complete set of the FF. It is also known as the 'Interim
Invisible Woman.' (see Q4.1)
Invisible Woman 2 (1995) - this is the clear plastic version
produced for the second series. Although the back of the FF
cards show a 'solid' Invisible Woman, the clear figure is the
one that was ultimately released."
For those interested in how difficult it is to locate each of these
figures (in descending order of difficulty):
Marvel Super-Heroes IW 1 - most difficult to find, no longer being
produced, produced in short supply
FF IW 1 - produced in semi-short supply, but not
to hard to find
FF IW 2 - four to a case, hoarded by dealers, but
still not to difficult to find
Marvel Super-Heroes IW 2 - no longer produced but still available
in large supply, usually below standard