I wouldn’t worry about it at the beginning. As your eyes improve you can try to make the gap a little smaller, but right now the main things are keeping the computer and reading at the edge of blur (as far away as you can without it getting blurry), and increasing your outdoor time and paying attention to as much detail as you can outdoors. Try to focus on every sign, license plate, leaves on trees, birds and squirrels, boats on the water, whatever there is to look out outdoors. Get outside as much as you can.
[In case I’ve misunderstood and you’re saying your current prescription is Right Eye is -2 and Left Eye is -2.25]
If you’re saying there is only a 0.25 D difference in your eyes I would just keep the lenses in front of them the same. For example, you could use -1.75 D in each eye for your normalized (distance) glasses and use -0.5 (or even zero correction) for viewing the computer.
Try to avoid putting -0.75 in one eye and -0.5 in the other.