This unknown emitter has much lower Vf as SFT-25R (3.3 V at around 5 Amps), the characteristics of this chip are different. The thermal resistance is lower, the maximum is at around 11 A. For comparison: SFT-25R test (F6 bin)
If this emitter is made by Luminus, then they use a different chip, a different design and another phosphor mixture. This unknown LED has almost no tintshift.
But the fact that they are using a different chip for an LED in the same series makes no sense, especially as the SFT-25R has not been on the market for very long and the chip will certainly not be replaced by a newer revision with different characteristics.