It should'nt matter whether you have 90spec on 88spec clocks or visa versa.

I stupidly moved one of the needles on the dial of a set of 90spec clocks when fitting Electro Luminesant kit, it screwd things up in the way you describe.

I later fitted an 88spec set of clocks to the car and although the dials are opposite way around they worked no problems at all.

Personaly Id stick the other clocks in.