Differentiating the two: 98 has a build number (on the System Information tab) of 4.10.1998 or 4.10.1998A
98SE has 4.10.2220A or 4.10.2220B
I'd say if possible, you may want to consider the upgrade to 2k or XP--assuming Linux isn't an option.
The caveats here are that XP's going to require a lot of juice which a POS running 98 may or may not have, and that trying to work a new device on old hardware is quite literally a crapshoot.
it is an ancient POS Compaq. I believe I wanted to load win2kPro on it 3 years ago, and discovered its system was not competent enough for it.
I'm running Win 98 SE, and I output through USB to my laser printer without difficulty.
And yeah, I need to upgrade too.