Hey,
Yes looks like a bounce.
Those two numbers are about the same (especially when you consider tht there can be up to a 20% meter variance)
Feed him as you normally would, for the rest of the morning, though I would probably avoid feeding late in the cycle since this can affect duration, and no food for two hours before pmps.
His bounces on Caninsulin the last few days were not lasting long one or two cycles.
As he has only just started on Lantus I might suggest getting a +6 (if he is still in the mid to high pinks) then I would leave him be until nearer shot time, but I would get a +11 perhaps just incase he starts to clear the bounce just before you shoot and throws a lower PMPS, so it gives you time to ask for help and make a plan.
With each progressive shot the depot will be building and you will start to see the full effect of the dose. We do see some cats initially have a strong reaction to the dose and then still need to go up, so don't be disillusioned if that happens.