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I have models (.suckt) that are working perfectly in LTspice, when I import them in Qspice they dont work

Does Qspice use a different syntax?

Most (SPICE) simulators use the same general syntax, but all or most simulators have features that are not supported in all the others.

Some features in LTspice are proprietary and hence not available in other simulators.

Examples of uniqueness include VDMOS models and anything that uses an A-device, like UniversalOpamps or logic gates. There may also be a few functions that are not portable. However, unless you disclose which models you are referring to, it's not possible to comment further.

If you're wanting to use QSPICE, perhaps you should ask in a QSPICE group. Perhaps it has an LTspice to QSPICE converter, I don't know.