If the repairs were not carried out to MoT standards (i.e. the lights produce incorrect aim/incorrect pattern or different light colour/intensity...i'd have a independant test station ensure they are happy to offer it a pass) then i would say you have a very strong argument for the replacement of the other light to make the vehicle safe and road legal, a repair thats a fail is worthless. It's unlikely that the lens is causing the problem however as they carry no tint and neither should the reflectors unless they were goosed, they may have swapped the bulb for a new one in the new light (or it may arrive from the factory with one in) and that will give you different light as one will be old and heading on to going PFuttt and the other is shiny and new. I wouldn't want the old one back, i'd want a new shiny one in the other side or a bulb to match the output ;D
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