[Elecraft] Matched Filter Crystals

[Terres Family]

Hi guys,=20

This may be na=EFve, but.....  on the Elecraft site at 'K2 PARTS AND MOD
KITS' I saw "K2KSB2XTLS Matched Filter Crystals (14) For existing K2 and
KSB2 combinations". I have a long stalled K2 kit that I am 'building',
got stalled when I got what must have been a bad optical encoder, while
trying to sort that out got and put together a SSB board, which has
never been tried. So I have been out of the loop as it were for quite a
while.=20

Are these crystals any different than what came in a stock K2 (serial
number <1000) and/or what came in a separate stock SSB kit?

Thanks,

Jerry Terres aa1of
Franconia NH