Paul,
Nope. Both are polypropylene. As far as I can tell, they are identical in construction and specs, except the 0.1uf caps are bigger than the .22uf caps.
And I'll second the warning on the ESA leads. Happened to me with one of my 100uf caps when I was building my Crack. Since the insulation on the lead was intact (making the break invisible), it took me forever to diagnose the problem...
Best regards,
Adam