[Ron Ramirez]

Generally speaking, no, they are not. Most of the low-value caps in these blocks are actually paper, not mica. I have seen a few dual 110 pF blocks that had mica caps in them, but in my experience, the vast majority of those I have replaced have been paper. So you really should replace these as well.

680 pF is the closest standard value for 700 pF, and will work in this circuit with no ill effects. You can replace 110 pF with 100 pF.