Can you enchant a plain +1 item to a +1 with property?

Can you enchant a plain +1 item to a +1 with property?

The Enchant Magic Item [ddi] says ... Alternatively, you can use the ritual to upgrade a common, uncommon, or rare item to a more powerful version of the item that is 5 levels higher.

Which I read as e.g. +1 sword to +2 sword, or +1 Flaming Sword to +2 Flaming Sword, but could you do +1 Sword to +1 Flaming Sword ?

-

What you have to do in this case is use Disenchant Magic Item get the residuum (at 20%/50%/100% (depending on rarity)) and then use Enchant Magic Item to put the enchantment you want on the item, paying the full cost.