What is the difference between a Lionel "W" tender and the "WX" version?

So, to clarify here...

WX was used on tenders that were paired with magnetraction-lacking locomotives, that normally did come with magnetraction, but lacked it due to war limitations. This alteration occurred during the late ‘40s, and early ’50s. The tenders are virtually identical in every way, other than the “WX”, instead of just a W, at the end of the number.

I don't think so.