The SLZB-MR4U is equipped with one Silicon Labs EFR32MG26 and one Texas Instruments CC2674P10 chipset, whereas the SLZB-MR5U features two Silicon Labs EFR32MG24 chipsets. Currently, the SLZB-MR4U is the flagship option for users who want Zigbee and Matter running on two different chip platforms. It’s recommended to use the Texas Instruments chipset for Zigbee and the Silicon Labs chipset for Matter.