I can confirm that product change from Sapphire Preferred to Freedom will not count as a "new" card.
I agree with LateToTheParty that you should consider keeping the Sapphire Preferred. Points are worth more (1.25 rather than 1.0 cent) if spending in their portal. Only by having a Sapphire card can you transfer to their partners. You can only get the bonus once every 48 months for either of the Sapphire cards so very possibly worth keeping for at least another year while you spend UR points.
You need to get an overall long term strategy (or maybe your strategy is get bonus, spend, move on). If you have a spouse then one of you can have a Sapphire card for 2 years then downgrade to Freedom and the other one gets the Sapphire for awhile. UR points can be freely moved between spouses.