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I bought a MacBook Pro 13-inch i7 3.1GHz which has the very fast SSD (1300 Mb/s) Can I put that SSD into my Late 2015 iMac 5k? Will it work at its maximum speed?

You may have to call Apple on this one. EveryMac doesn’t tell and OWC is not listing one: https://eshop.macsales.com/upgrades/imac… I really need to know the exact MacBook Pro you have. But it looks to me like the 3.1s have on board solder in memory. Standard Storage: 128, 256, 512 GB SSD Std. Storage Speed: 643.6 MB/s/1.3 GB/s* Details: Storage varies depending on the stock “base” configuration before the custom processor is selected. Originally shipped standard with 128 GB (MF839LL/A), 256 GB (MF840LL/A) or 512 GB (MF841LL/A) of flash storage. The MF841LL/A option also could be configured with 1 TB of flash storage for an additional US$500. The price of this 1 TB upgrade effectively was cut to US$400 on October 27, 2016. iMac 5K uses Standard Storage: 2 TB (Fusion) Std. Storage Speed: N/A Details: This model is equipped by default with a 2 TB “Fusion” Drive, which combines a 128 GB SSD and a 2 TB hard drive. It has a Serial ATA (6 Gb/s) connector for a 2.5" hard drive and a PCIe connector (PCIe 2.0 x4 NVMexpress interface) for the SSD. RAM Type: PC3-14900 DDR3 Min. RAM Speed: 1867 MHz Details: Supports 1867 MHz PC3-14900 DDR3 SDRAM SO-DIMMs (204-pin).