The panel is larger and just happens to be the panel with breakers for a good price.....does not come with a main breaker....so yes the breaker you install will be the same as the house breaker!60 amp both ends
The breaker in the sub panel can be any size 60 amps or larger. It is merely a disconnect. It is more economic to buy a "contractors package" with the main 100 amp breaker installed along with a number of branch cicuit breakers (typically 5 - 20 amp single pole).
Coastal South Carolina