Very surprised they'd do that. Both would be easier to control via TC than SS. Dicodes has their Resistherm material which is considered NiFe30. That 30 denotes the Iron content. Whereas for NiFe70 (Sandvik), that denotes the Nickel content. So they both have around the same Nickel content. All NiFe are around the TCR of Ti01, but is confusing for everyone. Steam-engine doesn't even show a NiFe48 material at all, but I'd imagine it could be the NiFe52 which steam-engine does have.