Normal Maps and Spec Maps can be found in the Warehouse tab on S4S.
Normal maps gives flat objects "fake depth", so if you didn't change the normal map to match your tomato shapes, then the default normal map would show thru on your tomatoes and have the shape of the peppers.
You will need to change both the Normal Map and the Spec Map because the default spec map is also specific to the original peppers.
The normal map is the gray one that looks lumpy
https://i.imgur.com/B0Nn0lw.png
Spec maps are colorful and give objects shine or glossiness, like the jar
https://i.imgur.com/An1Vhp9.png