The two mentions are variations of the same account under the year 1015, in columns 135–136 and 140–141:
"At this moment, Yaroslav received from Predslava the tidings of [their] father's death, and Yaroslav sent [someone] to Gleb, saying: 'Do not set out, your father (136) has died and your brother has been murdered by Svyatopolk."
"The same night news came from Kiev sent by his sister Predslava: "Your father has died and Svyatopolk settled in Kiev. He has killed Boris, and has sent [men] against Gleb. (141) Be exceedingly on your guard against him." (In Ipa, Xle and Rad: "settled in Kiev, having sent [men] to kill Boris and Gleb.")