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I can't vouch for this, but I understand that one should toss the pieces to be added with some flour and add them just before popping the pans in the oven so that the candy pieces remain suspended in the cake dough and don't all sink to the bottom. I'm not sure if this answers your question. Sounds wonderful though - good luck.
And of course I forgot the main gist of your question - I've done cookies with frozen, chopped candy added, and cooking time is the same.
Just like any "add ins" they will be fine