[Elecraft] K2 upgrade A to B

[John]

I purchased a K2 kit that was bought in 1999 and have been upgrading it to "B".  This kit was never built and the crystals are a different frequency than the newer ones.
Can I use the old crystals or will it suffer performance with the old ones?
The "B" version BFO calls for 4.9152 MHz and the ones in the "A" version I have are 4.915.  
The "B" version calls for 4.9136 crystals and the ones in the "A" version I have are 4.915.
Thanks.
John.

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