yah their 2 diff things tied and dotted. check out some thoery bks, like 1st to 2nd grade, they have excercises tht u can do so ur clear abt the values.
for abit more advanced readers or drummers, i gd excercise is too tke any reading bk like syncopation of modern reading in 4/4. tht the syncopation reading excercises and play all 8th on the snare and all dotted tied or quater note with the bass drum and ride or crash. u can play dotted on the snare as well.
this helps when ur reading charts, cause most charts are git charts and when there's a tied the normally hold the note. a crash sounds better it elongates the sound so to speak.