I think if you do this, first off--it's safe to do because if it looks weird to you, it's an easy thing to retrofit matching glass. But you might want to consider more of a statement than just plain ol' frosted glass. Something prettier so it looks like you're displaying nice glass and not hiding stuff.

I agree with Fori. If you do something that looks like a decorative decision rather than just mismatched it'll look better.

An alternative might be to put the same kind of glass in all, and to paint the glass in the unlovely cupboard with temporary paint, or even colored Glass Wax (remember that??). You could do seasonal designs, and get really creative, and then when you want to have clear you can just wash it clean.

Or you could go with one semi-transparent style, like reeded, where you can put things closer to the glass and have them show reasonably well, and push others toward the back and have them be blurrier.

Thank you.
I was considering decorative glass for the one cabinet. The glass is called "cathedral" here, but since I was not sure if that name would mean anything in the US, I called it frosted.
Since I am still unsure-I will think about it a little longer......

I was also thinking of having my cookbooks on one shelf in the (decorative) glass cabinet because I cannot think of another storage spot. Also unsure about that idea!

Hmm... cathedral is the term that we American glass artists use to describe glass that is translucent or transparent. Opalescent glass is opaque while something that is a mix of white and translucent is called wispy. When you say Frosted, what comes to mind is that your glass is one of the glue chip variety or maybe sandblasted to give some texture.

I think cookbooks would look great on your shelf.

Another choice is to mount fabric inside the cupboard doors. Gather it on a drapery spring top and bottom. This assumes there is a fabric in your design also.

The fabric-backed glass cupboard door needs to look very intentional or it will come across to visitors as a decorating mistake.