When we talk about

Escort MK5a (91/92)
Escort MK5b (93/94)
Escort MK6 (95on)

Then you're gonna need a MK6 box. IB5 boxes were available from about 95/96 on.

I'm not sure if you can just fit the S2 diff with LSD into the box. But if this is a yes, the ratios of the 1.4 box combined with the S2 diff will give you nearly the same ratios like the standard S2 had. With slightly shorter first three gears.