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Here's something I think might work for the requested case. It makes use
of next to count the items in the table b while it's iterating table a
using pairs (matching order does not matter).

function	compareTables(a, b)
	local	bi = nil;

	for k,v in pairs(a) do
		bi = next(b, bi);
		if v ~= b[k] then
			return false;
		end

		if bi == nil then
			return false;
		end
	end

	if next(b, bi) ~= nil then
		return false;
	end

	return true;
end


Interesting idea.

  Enrico