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Hi Chris
The original diagonal is what is referred to as an Right Angle Correct Image ( RACI ) diagonal, it has a series of prisms inside to bounce the light around to give a correct perspective view in the eyepiece. I have one the same. A cheapy but is mainly for terrestial viewing anyway, what I use mine for is in a cheap 70 mm refractor to make it an RACI finder scope.
The new diagonal that you have is a simple mirror diagonal that provides an upright image though reversed left to right, because it only has one reflective surface instead of several in the case of the prism diagonal, there is less light loss, presuming the mirror is reasonable quality.
Hope that helps.
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