Genny,
If your supplier has used immersion tin as a solderable finish; then you
should be able to assemble  the parts successfully.
After assembly the immsersion tin is disolved into the solder and becomes
part of the solder joint.  Immersion tin as such would cease to be part of
the finished product, and the probability of "Solder Whiskering" is non
existent.
I hope this is helpful.
George Milad
Shipley Ronal Inc

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