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Tru Oil is solvent(mineral spirits - actually, stoddard solvent), boiled linseed oil & a proprietary oil of some kind - most likely an alkyd type of drying oil.
You can save a couple bucks and get more for your money if you use Watco Danish Oil.
Or - just pick up a rattle can of gloss Polyurethane - which will give you a real gloss finish in a tenth of the time. Just scuff sand what's already on the grips and have at it.
Or - pad on some Zinsser Seal coat - a 2 pound cut dewaxed shellac product, similar to what the AK 74 and AK47 stocks are finished with. There is a learning curve involved here if you aren't versed in how to pad shellac.
To achieve the nice gloss finish with the other oil finishes will require 8 to 10 coats - allowing 1 to 12 hours dry time between coats. The more coats applied, the longer the dry time will become.
But - to answer your question - go right ahead and use the oil finish over the existing finish after giving the grips a light scuff sand. There's nothing in the oil finishes that will bother the existing finish.
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