🚀 go-pugleaf

A number of things here.

Primarily, you can't have two different versions of the same font 
installed at the same time.

ANY two different versions of the same typeface, regardless of format, 
even if from the same vendor, may not be identical, and may result in 
reflow differences as a minimum.

There are also intrinsic differences in the fonts themselves. The 
mathematics of the way the shapes are created are different between T1 
and TT. The two formats use different techniques for hinting. The 
rendering engines that interpret the font to display on a screen or 
convert them for placing ink on the printed page are also different.

Most of the time, these differences can only be seen under close 
analysis; sometimes however, they are significant.

When you DO get the correct driver, you have to be careful not to 
install two different fonts with the same name ... any OS WILL get 
confused, with unpredictable results.

  - Herb