Jamie is correct, the KT76A only accepts gillham code so you would need the Dynon converter. If you already have the AK encoder installed you would not be gaining anything by switching to the D10A as your encoder.
And depending on who does your transponder checks, you could run into a problem as the Dynon does not carry a TSO while the AK does.
On the flip side, the nice thing about using the D10A as the encoder is that your "displayed" (29.92 ref) altitude will always match your encoder altitude so "the shop" would never have to adjust the encoder to match your altimeter (ref CFR 91.217).