possible to change repos from rolling to stable, and without any downgrades?

[tuatha-solas]

Hello :-) Mate semi-rolling and updates run really well, but I'd just prefer to switch to security updates/stable. Haven't changed repos on any system before, but have bookmarked the stable/unstable repo info pages, which explain things really well, so it looks like I could do it. Question is that am unsure if switching to stable would mean that packages are downgraded in the process? Hardware (and software use) works best on latest updates already installed, so am hoping can keep everything as it is, but just switch over to future updates being security updates/from stable repo. Thanks.

inxi -b
System:    Host: watership Kernel: 5.15.0-2-amd64 x86_64 bits: 64 Desktop: MATE 1.24.1
                   Distro: SparkyLinux 7 (Orion-Belt)
Machine:   Type: Desktop Mobo: ASUSTeK model: TUF GAMING X570-PLUS v: Rev X.0x serial: <superuser required>
                    UEFI: American Megatrends v: 2204 date: 06/29/2020
CPU:          Info: 8-Core AMD Ryzen 7 3800X [MT MCP] speed: 4208 MHz min/max: 2200/4200 MHz
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT]
                   driver: amdgpu v: kernel
                   Display: x11 server: X.Org 1.20.13 driver: loaded: amdgpu,ati
                   unloaded: fbdev,modesetting,radeon,vesa resolution: 1: 1920x1080~60Hz 2: 2560x1440~60Hz
                  OpenGL: renderer: AMD Radeon RX 5700 XT (NAVI10 DRM 3.42.0 5.15.0-2-amd64 LLVM 12.0.1)
                  v: 4.6 Mesa 21.2.6
Network:   Device-1: Realtek RTL8192EE PCIe Wireless Network Adapter driver: rtl8192ee
                   Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169
Info:           Processes: 323 Uptime: 2h 55m Memory: 31.33 GiB used: 3 GiB (9.6%) Shell: Bash inxi: 3.3.07