Looks likely you can.
Turn water on.
No need to get it tight when you fit new one. Just a gentle nip up.
You need to get water out cistern first with sponge and dry up.
Get that inlet off. Get that far and it's all good
Those close coupled designs are a PITA!
If you can get a tool up there then sure, go for it, but I usually have to remove the cistern and then change both fill and flush to one's that are top removable.
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