of course not all navies have the same amount of money. however, ships are classified not based on their country, but on ships of other countries to which they are comparable. calling your small, armoured cruiser a battlecruiser means the invincible would be it's opponent in a comparision.
I know I'm late to the party, but that's BS. Ships are classified on whatever criteria, real or imagined, the owner decides on. He could decide that henceforth all leaky row boats be classified as battleships and non leaking ones as BestBuy, Floating and there would be nothing wrong with it. It would be confusing as all hell, but arguably no more confusing than 10.000t destroyers in a world without torpedo boats.
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