The substitution of the equivalent types depends on the compatibility of types, whether they are fully compatible, forward compatible, or backward compatible.

等价的类型可替换程度取决于兼容性，是完全兼容，还是前向兼容，还是后向兼容。

youdao

Most changes to the data types in the input or output message are not backward compatible.

对输入或输出消息中的数据类型的大部分变更都不是向后兼容的。

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From the outset, we were clear that Spring 2.0 was going to be fully backward compatible, or as near to fully backward compatible as possible.

从一开始，我们很清楚Spring 2.0将会完全向后兼容，或者说尽可能地完全向后兼容。

youdao

But it's backward-compatible with the B standard, meaning that a router or other access point that uses the G standard can also support a notebook outfitted for the B standard, but only at the slower speed.

FORBES: Magazine Article

And all of a sudden your relatively old refrigerator or air conditioner doesn't work because the new operating system isn't backward-compatible with the systems in these devices.

CNN: Home, sweet networked home