Freewheel widths?

Are all freewheels the same width ? Im renewing a dicta 16t 3/32 as part of upgrage to 1/8 and was about 3mm out of chain alignment on old set up, just wondering if it being a 1/8 it maybe wider and give me the 3mm or else i`ll have to use some spacers.
Thanks in advanced for any answers given.

To adjust chain line get some 1mm cassette spacers to fine tune chain line.

Thanks for the reply, thought maybe different manufacturers might of had wider bases, ive got some of them in the parts bin so i`ll use them on the free wheel side but the fixed side i dont think theres any room, as the lockring is right on the edge of the tread as it is. Should be ok as its a 3/32 fixed cog but using 1/8 chain so might have enough float to get away with it?
Only one way to find out, i guess, hopefully freewheel comes tomorrow so can get it sorted.

Each freewheel model has a different offset between the thread base and the teeth. WI are pretty wide.

Pretty sure Sheldon had an article...

I have a question related to this.

I have a new fixed/fixed hub (Planet X track MKII) and freewheel (Shimano). I screwed the freewheel on hand tight, put wheel on, did chain and the turned pedals by hand. I got the normal slippage as the freewheel tighened on, then the wheel would lock up. Repeated multiple times, fiddled. Confused as hell.

Eventually removed freewheel to find a small but visible amount of metal dust. Turns out there's a lip on the outer side of the freewheel threads that's interfering with the axle part of the hub and basically locking it up when the freewheel gets tight..

Suspect I need a cassette spacer to push the freewheel outwards but I'm concerned that there now won't be enough thread. Also baffled that this problem exists.

Might not be much use to you but the dicta freewheel i just took off has no lip at all that could interfere with the axle.
Sturmey archer i`m replacing it with hasnt turned up yet ( thanks royal snail) so i cant compare it to that one either.

Cheers, that's actually helpful, yeah!

I've got no probs with the cheap dictas. They and the Shimanos get loads of bad rep online but I've only really had good experiences...

Just to conclude my question, ive gained the extra 3mm needed just by swapping a dicta 3/32 freewheel to a sturmey archer 1/8 , no need for spacers.
Cheers one happily aligned, quiet chain now !!