Font Problem

I have 2 computers on my home office network. Both are running WinXP Pro. I
have 2 different versions of Garamond font on the computers. I would like to
have the same version on both - we use it a lot. The preferable version is
described as Open Type Version2.35from Monotype. The less preferable is
Garamond Antiqua True Type Version1.3 from HP. Here's the problem: If I
delete the Antiqua version from the second computer and then try to install
the Open Type version copied from the first computer, when the font
installs, it installs itself as the TrueType Antiqua I just deleted. The
problem is that although the typefaces are very similar, they size
differently, and that wreaks havoc in our Publisher files. Can anyone give
me a lead on why this is happening & how to correct it? Many thanks in
advance, etc, etc.
--
Charles Joseph
Silk Purse Productions