It's a Loyd part. The part number is listed in the Loyd parts list. It's not early, the clue is the size of the number 13*** and the date 1941. Early British parts would have a much lower part number and a 193* date. It also isn't mentioned in the early British carrier parts list.
The British production was suffering from German bombing, this is one of the reasons carrier production was started in Canada. I think a batch of carriers were ready and the only units available (perhaps due to bombing) where the Loyd ones, they function and fit exactly the same as the carrier type, they just look different. I think this is one reason for the non folding gunners armour, again this isn't an early feature as early carriers all have folding armour. It was just easier and quicker to make the fixed type
If the date fits the carrier, keep them on. Strictly speaking they're not correct as they're a Loyd part but it's all part of the story. They may have left the factory fitted to that vehicle or perhaps swapped in service by the Kiwis, they had Lyods too. Either way it's up to you, it won't effect the use of the vehicle, just it's appearance.