Despite the misleading name, the Pixel 4a (5G) is not a variant of the 4th - generation Pixel 4a which has an older mid-range 2019 SoC. The Pixel 4a will - be end-of-life around 2 months before the 5th generation devices but will - receive far less extended support past end-of-life since it won't receive an - official release of Android 14 and has an older SoC / kernel branch aligned - with other 4th generation devices which will already have been in extended - support for almost a year at that point.
+ generation Pixel 4a which has an older mid-range 2019 SoC. The Pixel 4a was + released about 2 months before the first 5th generation devices but those are + likely to be supported more than the 3 year minimum while the Pixel 4a is very + unlikely to receive longer support due to the older SoC. GrapheneOS extended + support for 4th generation devices will end with the release of Android 14 so + there won't be much leeway provided by it for the Pixel 4a.