Snacks, my second son had a childminder from the age of six months when I returned to work full time. We did not follow a GF routine, but it felt like he was two babies - a weekday baby and a weekend baby. Here are just some of his routine variations over the six months to 18 months period
Nappy changing: he would lie on his back and stay on his changing mat without fuss with his chldminder. He crawled away from me at every opportunity.
Day naps: he often happily went down to sleep in the childminder's quiet living room, inside the play tent. At home, I had to take him to his cot in his bedroom for a nap, and listen to him grumpily settle for up to half and hour. As he grew older, chances were I would have to forgo the arranged nap and bring him downstairs. He would then get some zizz when taken out in a pushchair.
Feeding: he had a wide range of food at his childminder's, most of which apparently he ate without fuss, while sitting in his high chair.
At home, he refused half the things I offered, in favour of milk, and by 18 months easily escaped from his high chair at every opportunity.
I know my childminder was not telling fibs, because several times I saw the above with my own eyes, and could hardly believe it!
That's not to say my baby didn't give my childminder grief - throwing food, crying, etc etc. And sometimes my childminder would say he had been in a horrendous mood all afternoon, yet at picking up time, he would be all smiles and I'd have a lovely, easy evening with him.
IMO the diffenent home environment and people he saw had lots to do with his changes in routine - that's why he also took days to settle whenever we went on holiday.
As others have said, please, please, don't beat yourself up about different routines. As long as he is happy 7 days a week, what does it matter? Of course, I am not saying this from a GF perspective, and I don't want to underestimate your worries at changing GF routines. Hopefully you'll get specific advice about this.
Just one small suggestion: how about asking your your childminder to write down a brief diary of your baby's day (feeding, sleeping, trips out in the pushchair etc) and give it to you when you collect him? It can be difficult to go though issues in detail at collection time. I have found it helps everyone to have a list of what went on when. You say your childminder follows GF routines - a daily record from her would serve as back up.
Looking ahead, once your baby can talk a little, IMO it gets easier to leave them. Slowly you and your childminder will begin to get a little feedback direct from your toddler. I've found this so reassuring. I do remember how unsure I felt at times about leaving my non-talking baby with anyone but myself or dh. I'm sure that's only natural. It really helped to pay daytime visits to my childminder so I could see for myself how settled my baby was with her.
Sorry, I am straying off the original subject, so I'll end now.