Those ADRs are quite close together. It's just a consideration because you will be AT LEAST an hour + at Akershus so you would be checking in for Le Cellier just over 3 hours after your breakfast. I don't know that I could do that. Are those the only times available?
I'm really hoping for a dinner reservation, so maybe I'll keep trying for Le Cellier dinner. Akershus is a must since my DD loves princesses and we cancelled CRT since it's too expensive.
If you really want to be sure to have a TS lunch that day, you could book Coral Reef and cancel it if you do get Le Cellier. I do still feel that it is too soon for another meal though even at 1.30. Personally after a TS breakfast I would not want anything before 3.30 pm at the earliest and even then, I would do later if I could. Snacks are substantial at Disney and you could get buy with a snack if the wait is too long for dinner. Just like you don't want your DD to miss her special meal, it would be really disheartening to go to all the trouble of getting a ressie you really want, only to be seated and not feel like eating. I hope you get a good time. Don't give up on it either - I secured 2 sought after meals when we were there during Easter last year just by stopping by the concierge desk every morning. Got them both so there is always hope - and plenty of it. 
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.I had the EXACT same problem....we are going in May
we decided to switch Akershus to dinner (though breakfast was our first preference) because we really didnt want to give up Le Cellier even for lunch
AND THEN
I was able to book Le Cellier for 6pm.... so I had to go back and re book Akershus for breakfast AND it was BOOKED.
I finally got Akershus breakfast back- but it took a ton of checking online and its now for 9:30am instead of the 8:10am we had....
so- I would keep akershus where you have it now just in case, but I would also try to book it for a late dinner so you can keep Le Cellier for lunch.... then try to get a later Le Cellier!

Ok, so I could keep Le Cellier for lunch at 12:35 and do dinner at Akershus instead at 6:40. Does that sound better?

Definitely better than your original plan. If dining with the princesses is that important to your daughter, it is crucial to keep a reservation at Akershus. Like the previous poster wrote, you like won't be starving for dinner after a hearty lunch at Le Cellier, but you will at least consider eating again. You chose Akershus for the setting and the characters, and the look on your little princesses' face when she meets the princesses will make everything worthwhile.Ok, so I could keep Le Cellier for lunch at 12:35 and do dinner at Akershus instead at 6:40. Does that sound better?
They are so hard to get, usually one of the first restaurant to fill up at EPCOT, according the one of my conversations with the staff on phones at reservations.
. ADR's are too confusing...lol.