ESTP and ESTJ can resemble each other when the situation rewards the behaviour they both can perform.
A type comparison becomes thin when it only lists traits. The same visible behaviour can come from different internal questions. One person may be checking reliability, another may be tracking meaning, consistency, values, timing, or options.
They share E and S and T, so the surface can overlap even when the underlying pattern is different. That overlap matters, but it should not erase the differences in information style, decision style, and stress pattern.
ESTP's function stack is Se · Ti · Fe · Ni, while ESTJ's is Te · Si · Ne · Fi. In plain language, similar behaviour may come from a different blend of attention, decision-making, and stress response.
Use the comparison as a careful self-reflection tool. It can help you notice a pattern, but it does not prove ability, maturity, compatibility, or a fixed identity.