Not so much, term 'pancerni' for large part of second half of 17th century was used only to mark better equipped units or those of higher status (i.e. hetman's), while rest of such cavalry was still called 'jazda kozacka' (cossacks, not Cossacks). During 1672-1676 war with Ottomans term 'pancerni' started to be used for all 'jazda kozacka', no matter what equipment and armour they had. Despite this, there are still some period sources, including army musters, that use older term 'jazda kozacka' or 'kozacy', without bothering with name 'pancerni'.