Each zip contains the ggml-[model]-encoder-openvino.bin and ggml-[model]-encoder-openvino.xml files required for the main matching ggml-[model].bin
You can find the main models
here
To use the OpenVino version of whisper.cpp you require the main model and the extracted contents of the matching zip in the same directory (you can safely delete the ZIP file once extracted if you desire)