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LTC4290 design and the IEEE 802.3bt compatibility

We have a two years old 4 port LTPoE++ (LTC4290A, first four ports) design based on the DC1843B demonstration kit.

Is it possible to modify this existing hardware (e.g.: by simply changing the LTC4290A to a LTC4292) to get a fully IEEE 802.3bt (PoE++) Type 4 (~100 W) compliant equipment? Or is it only possible with a full redesign of the product?

Thank you very much for any help in advance.