It follows that the former positioning is taken into account in current purchase decisions. Awareness and distribution take time and cost money to develop. It has to build up awareness, distribution, reputation, and convenience perception after launch. Two additional other observations are relevant here. It is already active in its current markets.
Introduction only occurs when a product is first launched into a market region or regions.
As far as the customers in that market are concerned, product 4-1 is a new product. It would have to earn market position, awareness, distribution, etc.