I queried my novel last year to mostly passive passes. Now I'm working on a revision (self-prompted, not an R&R), and I'm wondering how to handle the next round of queries.
For context, here's what I've changed:
Protagonist/focus of the query
Where the book starts, therefore the included pages
About half the plot
What's stayed the same:
The characters, their relationships to each other, and their general situation
Can I requery the same agents? If so, do I treat it as a revision or a whole new novel? Or should I stick to agents who have not yet heard from me?
Why would you requery agents who've not responded? (I'm assuming that's what you mean by a passive pass.) Are you trying to torment yourself? Stop that! Tormenting writers is MY job, and I'm good enough at it for both of us.
You can requery anyone you want, and you've probably changed enough of the work so it's not going to sound familiar to most of the agents you requery, but again, why would you query them?
You're also assuming that it was the query that gave rise to the rejection. That's not always the case. No matter how well written the query, I'm likely to pass on books I don't think I can sell; books that don't sound fresh and new; books that just don't interest me. None of that can be revised out of a book.
There are a lot of us out there these days. Try some new names and find someone fierce about your work.