No, a FCLGA1151 CPU is not compatible with an LGA1151 motherboard.
No, a FCLGA1151 CPU is not compatible with an LGA1151 motherboard.
Considering your setup, you can upgrade to a CPU that supports up to 2666 RAM. Your current i3-9100F should handle the change smoothly. For the RAM, your motherboard already supports 2666, so it should work fine with the new specs. Regarding the CPU, an Intel Core i5-9600 (FCLGA1151) is compatible with your LGA1151 motherboard and will function properly.