Screed elements from different vendors have been successfully used for decades in drywall reconstructions and new constructions . When laying on underfloor heating elements, make sure that the benefit "The thinner, the better" remains maintained.
The IDEAL heaters have no cavities and therefore distribute the compressive load evenly, higher point loads cannot "break". This means that e.g. Fermacell screed elements can be used from 20 mm instead of 25 mm thickness. Also Knauf Brio 18 mm screed elements (housing) and 23 mm (commercial loads) provide an excellent opportunity to quickly install the underfloor heating and to use it immediately.