how can i get the current release of my devices

so I am using the suggested versions api to get new images now if I search by the current img everything is ok but when I try to search by the current release I get that the version is invalid. Lets say this is my show version i get the following Cisco IOS XE Software, Version 17.18.02 Cisco IOS Software [IOSXE], ISR Software (ARMV8EL_LINUX_IOSD-UNIVERSALK9-M), Version 17.18.2, RELEASE SOFTWARE (fc3) … ROM: 4.6(REL) System image file is “bootflash:ir1800-universalk9.17.18.02.SPA.bin” …