Chimeras are where two different genetic cell lines are propagating often in a single leaf, stem, fruit, or even an entire organism. Striped fruit is an entirely different mechanism. It is caused by a single gene which can flip back and forth between two states.
It’s a very fine line splitting those hairs between definitions on that topic. Check out this Red St. Lawrence Apple. That is a very beautiful striped apple! Red St. Lawrence Apple - Fedco Seeds
Some mutations are a result of methylation, transposons, or other genetic events that are not permanent. When a cell undergoes meiosis (splitting for reproduction), often the DNA will change such as from transposons. When this occurs, a mutation may be changed in ways that make it no longer expressed. In other words, some mutations are not inheritable.
My old red Bartlett tree has a small limb sport that produces striped red and green, or yellow depending on the ripeness, pears.
Its small and low on the tree so doesn’t do anything but fruit. No new vegetative wood. Im thinking about a concerted effort to get it to produce some usable scions so i can make a new tree.