A ph that drastically different would quickly kill them. Think about the bottles of ph up or down which says only move ph 0.2 in 24. That difference is 100 times difference they won't adjust in one day. Also I really think you should consider putting them in a container or quatantine tank and not adding them straight to the established tank even with acclimation. It just isn't doable. They won't have enough time to adjust and they're water is likely to become filthy other wise.
I say this bc I recently did this same thing. I received fish from live aquaria and fish from a local store. I tested the ph and temp of the water they were in then worked to match it. I had already aged water prepared for both grow out bins. I added extra o2
to the water in addition to filtration in order to protect them from ammonia spike. My three biggest concerns were, temp, oxygen/co2
level and matching ph. Once I did that I didn't drip acclimate them bc the parameters were very similar. I just did the good old fashioned hole punch in the bag thing and of course the water was treated with prime. Everyone has their methods i just felt like its best to try to match water as much as possible. It took a whole week before one of my fish from the local store to become accustomed to a warmer tank. He was kept in cold water (crying shame) I literally had to set it to around 75 at first over period of days I have gotten him up to 77 degrees with no signs of distress. I was lied to originally about tank parameters for him until I mentioned he was super sick. I literally have to scoop him out and put him in a shallow bowl 2x a day for feedings and put in a hammock so he doesnt have to swim too far to get to the top (labyrinth breather). I say all this to say sometimes it can take a long period to acclimate when the parameters are just that different. Some others may think otherwise but its just risky especially if you spent good money to get them. Adjust them over a period of days at least is just my opinion