Different: not the same as another or each other. Unlike in nature, form, [and]or quality.
It is really not all that different. Love comes in many shapes and sizes. Your expression to a friend of love and appreciation is born from exactly those emotions and thoughts, named love and appreciation. Context decides exactly how deeply those rivers run. "I love you" could mean sarcastic irritation, simple appreciation, platonic friend love, or deep passion, with many shades of meaning in between those mentioned.
"I love you. Seeing you the other day brought incredible joy to my life. Your smile brings the sunshine to my day." Judging from whom I borrowed this sentiment and towards whom it was directed, this is one of those platonic expressions of appreciation between two college friends, who happen to both be female. Yet, a girl could use this sentiment as a romantic expression between herself and another person. If the other person were male, all would be well and fine. If it were a romantic expression between two females, a significant number of people would disapprove, violently even. Because of course humans being evil as we are, blinded by pride and seeking always darkness, must keep love caged up and properly directed. Such a powerful, beautiful thing as love needs restrained.
Lust of course is at least usually some part of romance. Eros is a physical love. Actions change reality. So when desire has bad effects or intentions, of course it needs restrained or at least needs to mature. Humans make mistakes. Loving someone does not necessarily save anyone from making bad choices for that someone. But that is not love's fault.
It is not all that different. Whose ears I choose to whisper my "I love yous" into and whose sweet lips I choose to express that upon are not so different choices from those ears you speak into and lips you choose to so appreciate.