I don't really know much about J-pop but I like k-pop. Are there j-pop groups that are more like k-pop?
J-Pop is starting to look a lot more like K-Pop but it's different. J-Pop isn't on the same level but they do sing live versus K-Pop which has since maybe JYP's success mainly lipsync.
K-Pop = A lot of lipsync artists, spends their effort on perfecting looks, choreography and overall perfection. Some groups genuinely have great singers but not all and usually only one or two in a big group can sing. They will use autotune and other means to make it seem like they can sing since choreography and looks is more important. This excludes groups from SM entertainment (mostly), IU and others where they will sing live.
J-Pop = More about giving their all in a performance, usually doesn't lipsync since it's taboo in Japan. Super fans are as crazy in J-Pop as they are in K-Pop. Underground groups have cult-like followings and girl groups have their fans dance this otaku dance which is easy to do and often uses some type of light in each hand. J-Pop is very fan-engaging but some of the groups, like the big named boy bands are a lot like k-pop boy bands now.
Both draw their inspiration from the united states (mostly). If I were to suggest J-Pop groups I would need to know what kind of music you like other than “k-pop”. Do you mean like Blackpink? or TWICE? GFriend? Super Junior? There's a lot to choose from in genre! <3