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1-in circuit a and b drain voltages supply is same
2-in a gate supply is for drain term,inal of m1 and m4, while in b the input is for m3 and m4
3-in a m4 and m1 is draining by the in, while in b m3 and m4 ars draining by the in
Threshold will be different.
Let suppose Vthp = Vthn and neglect body effect.
For (a) threshold will be vdd/2 (when PMOS current is equal to NMOS current).
For (b) threshold will be (vdd-2*Vthp)/2 or vdd/2-Vthp.