TN754 is equivalent to TN754A....TN 754B is a latter issue of the circuit pack...
When circuit packs are first issued they may require fixes that, because the earlier packs were not software upgradeable as some are today, requires a new issue.
How does that apply to you? some packs are not usable for the latter switches...so the newer switches may not accept them...
The 754B is accepted by most all latter switches...
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