boot – initrd.img and vmlinuz how to install the only one 1 lower than the higer? Ubuntu 18.04

I have not updated my Ubuntu 18.04 for a long time.
today I have run sudo apt update && sudo apt upgrade
after this I did sudo update-grub that gave below the result.

pratap @ i7-6550U: ~ $ sudo update-grub
Generating grub configuration file ...
Topic found: /boot/grub/themes/TestTheme/theme.txt
Image of linux found: /boot/vmlinuz-4.15.0-42-generic
Start image found: /boot/initrd.img-4.15.0-42-generic
Image of linux found: /boot/vmlinuz-4.15.0-34-generic
Start image found: /boot/initrd.img-4.15.0-34-generic
The Windows Boot Manager was found at /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
Ubuntu 18.04.1 LTS (18.04) was found in / dev / sda10
Ubuntu 18.10 (18.10) was found in / dev / sda8
Adding an entry in the boot menu for the EFI firmware configuration
fact
pratap @ i7-6550U: ~ $

I found that 4.15.0-42 is greater, and 34 is far from 42,
I want to keep 41 as the secondary option next to 42.

Is it possible to install it replacing 34 in my case?