upgrade from 4.20 to 4.3.7, client update necessary?

existing 4.20 setup, server being retired.  New box has 4.3.7 installed and working.  Testing some of the
external hosts client side scripts (sending to new box) seems to work fine, using the existing 4.2.0 client.

Is there a pressing reason the client side stuff must be upgraded, or can I just not bother?

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