I think the first thing to ask is it the pony currently laminitic as well?
Honestly, I think a little of what you fancy is ok - but use common sense. There can be quite a high level of sugars in both of these to little is the key word in the above sentence. Try grating them to bulk the amount out without giving more.
My opinion is to be more cautious with what to feed during active laminitic bouts, but again one every know and then probably isn't going to be a deal breaker.
As a general rule, avoiding feeds with higher levels or easily digestible starches and sugars in are best avoided...if you're unsure all the main feed manufacturers have owner helpline and will advise you best on this IMO.
There are a lot of feeds available now that have be assessed by the laminitis trust...they are often a good starting point at least. This link may give you more detail info as to their requirements and help you assess you current feeding http://www.laminitis.org/approval.html
I seem to have it in my head that carrots may be higher in carbs overall than apples they are something I very rarely give to any of my horses but they do seem to be a common feed.
I agree with Imogenburrows lol. If in laminitis I personally wouldn't give any of these threats. My pony who's prone to laminitis gets occasional apple, celery and greens but spread round the yard where they all have to search for these titbits. She gets cleavers (goose grass) nettles when in season too. Also the occasional bit of willow and hedge browse she has access to. I never give 'treats' daily as part of feed either.
I've had some serious falling outs with my sister in the past who said I was mean not to give polos and stuff, she would give mine polos behind my back! Grrr. She has learned the hard way sadly and treats with part of their daily balancer ration now. Her horses love it just a much.
I'd worry at Yards if anyone was giving them stuff like polos. The one yard I was briefly on a few years ago had 'visitors' who brought the horses carrots and polos!