Objects in a Mendix application can never have the same ID. In the ID of the object of a specific entity there is also a part of it the unique ID of that table.
The Object ID consists of:
Those binary codes are combined and transformed to an integer representation.
Example
Let's say we have entity with ID 28 and the 208th object of that entity type, so:
Those two combined give a binary representation: 00000000 00011100 00000000 00000000 00000000 00000000 00000000 11001010.
Transforming this to an integer gives: 7881299347898570 which looks pretty much like a typical Mendix Object ID.
For translating binary to integer values, you can use: https://www.mathsisfun.com/binary-decimal-hexadecimal-converter.html