Both the smartphone sports dual rear cameras, 64GB (eMMC 5.0) Internal memory, 4G VoLTE connectivity and Android 7.1.2 (Nougat) with MIUI 9 OS and has Hybrid Dual SIM smartphones.
But the differences are.... the Redmi Note 5 Pro sports 5.99-inch Full HD+18:9 2.5D curved glass display Corning Gorilla Glass 3 Protection, 1.8GHz Octa-Core Snapdragon 636 Processor, 4GB and 6GB of RAM, 20MP front camera and 4000mAh battery while the Mi A1 sports 5.5-inch Full HD 2.5D curved glass LTPS display, Corning Gorilla Glass 3 Protection, Octa-Core Snapdragon 625 Processor, 4GB of RAM, 5MP Front Camera and 3080mAh battery.
Price .....
Xiaomi Redmi Note 5 Pro : Rs. 13,999 and Rs. 16,999
Xiaomi Mi A1 : Rs. 14,999
