You can access the entries when you can access the app (e.g. open the app)
IndijaNoesbarMahjoeddin Will the orig ipad journal be upgraded to Pro in line with my IOS purchase? Automatically or how?
It should, if you use the same Apple account on both devices
They should automatically merge when you connect both devices to the sync. You can always create manual backups in the settings to be on the safe side. When there is the identical entry on both devices (have they have the exact same timestamp) it should not come to duplicates. Otherwise, both entries will be in the merged result.