You shouldn’t install packages from another version’s repository, can’t you find the package you want on webpin or the additional package repositories?
As I’m unfamiliar with the package you wish to install I can’t say for certain, but I would guess there must be a very good reason for it not being available for 11.1 (maybe it isn’t compatible for some reason).
As Fedora is a different distribution, which version Fedora it was included in has no relation to which version of openSUSE it’s in.
My advice is, if you really can’t live without the package, install 11.2.