Is DDR4 RAM compatible in a DDR3 RAM slot?

ddr4 slot   Dan ddr4 slot vs ddr5

Foxconn DDR4 slot - standard type AH08847-A9B2G-4M

AMD Socket AM4 Chipset AMD Socket AM4 features motherboards with DDR4 memory, PCIe® for NVMe and graphics, plus native SuperSpeed USB 10Gbps support on Brand New DDR4 260P Laptopnotebook Memory Slot Socket Forward AS0A821-H2SB-7H 24 sold Featured brands

dinosaur slot MSI PRO H610M-E DDR4 Motherboard, Micro-ATX - Supports 14th13th12th Gen Intel Core Processors, LGA 1700-2 x DIMMs , 1x PCIe x16 slot, 1 x DDR4 RAM Slot & 1 SATA SSHD Slot 3 Years Warranty+2 Years Extended Warranty Up to 16GB DDR4 SO-DIMM memory support;