Hello,
Our icons use the xstore-icon font. If you want to use icon of any other font you can call the font using font-face https://www.w3schools.com/cssref/css3_pr_font-face_rule.asp and then change the stars to what you need using below custom CSS
.star-rating span:before, .star-rating:before {
font-family: xstore-icons; /* Replace by your font-family here */
content: '\e930d \e930d \e930d \e930d \e930d'; /* Replace by your icon code here */
}
Regards