Worried about being Pigeonholed

I have two completed manuscripts - a 120k word novel, and a 25k word novella.

The novel skews literary and the novella (which I wrote during the period when the novel mellowed in its drawer) is a breezy amuse-bouche, which I enjoyed writing and would probably find a wider audience.

Both have their merits, but they are very different works - one a dense, slow-boiling historical fiction, and the other a frolicking satire with engaging characters and snappy dialogue.

I'm preparing to submit the novel to literary agents and I am afraid that if it gets picked up, slow-paced espionage will be all that is ever expected of me. I'm not worried about my reputation as a writer - I just don't want to be forced to write one kind of thing - being robbed of my versatility. Thoughts?

edit: a word