The Wizard MCII is (from what I understand) based on the Jubilee circuit, so it’ll have a different character to a 2203/04. Then factor in what makes a Wizard a Wizard - they’re their own thing.
My 25w Headfirst is based on the Wizard MCII circuitboard - but then it’s a Headfirst, so it’ll be different to a Wizard anyway and no doubt a different experience to a full fat 100w Wizard. That said, I guess it’s in the ballpark so I’ll chip in with my thoughts.
I’d say the Headfirst definitely occupies a different role to my 2204.
For me, the 2204 with Hot Mod v2 is classic rock through to hard rock. Nice cleans too. Not much in the way of tone shaping and there’s a single channel. I found where it sounds best to my ears and I haven’t touched the controls since.
The Headfirst can do the classic rock stuff too, but there’s way more gain on tap plus channel switching, channel boosting and a lot of tone shaping options. No doubt the same would apply to a Wizard.
There’s certainly some shared DNA in the tones - the Headfirst (and Wizard) tone is certainly Marshally at heart, but they are very much their own flavour / spin on it. If you like Marshally tones, tone shaping flexibility and added gain options, the Wizard (or amps like the Alta 100 from Headfirst) are the way to go. But if you want a classic Marshall tone, then I’d suggest getting a classic Marshall.