Yes, in most cases you can just backup your config and restore it into a different device. pfSense will ask you to re-assign the interfaces to whatever is available in the new hardware and you're done.
However there are some caveats! If the new hardware has fewer total interfaces for example you you need to lose some or convert to VLANs etc. If your config contains a lot of sub-interface types like VLANs, LAGG or PPP it can be easier to modify the config manually before restoring it.
And if the new hardware has the same interface types as the old device pfSense will just use them without asking your to re-assign which might not be what your want.

In this case moving from the 1100 to the 2100 hits several of those points so it's better to modify the config before installing it. But since you bought that from us we can do it for you if you open a ticket with us.
https://www.netgate.com/tac-support-request
And, yes, it will bring all the settings from the 1100 and packages will be reinstalled.

Steve

I will try that, and see how it goes.

If not, I can do it manually.

/Jan

Correct, the patches above are copies of the changes made in the repository that will be used to build pfSense 2.4.4-p1. So not "hacks" exactly.

If it's all working for you now then there shouldn't be anything to worry about. When you upgrade to 2.4.4-p1 the manually edited files will be replaced with the copies from the new release, which already contain these changes.