WRT1200AC upgrading between major versions

I currently have OpenWrt 18.06.2 r7676-cddd7b4c77 installed on my Linksys WRT1200AC. Can I flash with openwrt-19.07.2-mvebu-cortexa9-linksys_wrt1200ac-squashfs-sysupgrade.bin or do I need to do a fresh install with openwrt-19.07.2-mvebu-cortexa9-linksys_wrt1200ac-squashfs-factory.img?

You do not need any "fresh install" with factory image, but it might be safer to install without keeping settings, and then manually config the router after the flash.

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