Are you saying the difference in names is "SIL Ezra" vs. "Ezra SIL" ? That's too confusing!
You're not alone to be confused. I had completely forgotten the existence of two versions of the same font design. I may have just seen that it used PUAs, so I did not install it (I did not remember that it used PUAs, and the wording of the sentence that introduced it in this discussion made me think that it was NOT using Unicode, and thus not PUAs which are Unicode things; that's where I supposed it was using some legacy Latin-1 override or similar hacks found in some special-purpose fonts, or in legacy non-TrueType-based font formats, like PostScript mappings within a 0-based indexed vector or hashed dictionnary of glyph names...)
