基本上意思相同,都是在列出若干实例后说“这仅仅例举一小部分”,要说区别to name but a few 似乎比 to name just a few 的范围更广.例如：
I like fruits,apple,banana,pear,to name just a few.
Fruits are produced in China,apple,banana,pear,to name but a few.
实际区别不大,视你讲话时的立场而定.